EP0469982B1 - Method for printing on a synthetic resin molded body and headphone housing on which printing has been made by the method - Google Patents
Method for printing on a synthetic resin molded body and headphone housing on which printing has been made by the method Download PDFInfo
- Publication number
- EP0469982B1 EP0469982B1 EP91402120A EP91402120A EP0469982B1 EP 0469982 B1 EP0469982 B1 EP 0469982B1 EP 91402120 A EP91402120 A EP 91402120A EP 91402120 A EP91402120 A EP 91402120A EP 0469982 B1 EP0469982 B1 EP 0469982B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- molded body
- printing
- synthetic resin
- letter
- thermoplastic synthetic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/267—Marking of plastic artifacts, e.g. with laser
Definitions
- This invention relates to a method for printing on a molded body of a thermoplastic synthetic resin and a headphone housing on the surface of which printing has been made by the printing method.
- a printing method such as a silk screen printing has been extensively applied.
- the silk screen printing method includes the steps of transfer printing a letter, character or a figure on the surface of a synthetic resin molded body with a thermosetting ink, such as an epoxy resin, white pigment or a silver white pigment, and heat setting said ink for burning and printing the letter etc. on the surface of the molded body.
- thermosetting ink is simply applied to the surface of the molded body, it is easily abraded by friction or peeled off during handling and thus becomes hardly visible.
- a printing method which makes use of a laser light.
- a coating of aluminum for example, is formed on the surface of a synthetic resin molded body by vacuum deposition and the coating is irradiated with the laser light for selectively removing the coating in accordance with the contour corresponding to the desired letter, figure etc. to expose the underlaying surface of the molded body to effect printing.
- US 4 032 691 discloses a recording material comprising a highly thermally insulating support on which is provided a heat-sensitive layer which deforms when exposed to radiation having a high energy density.
- the present invention provides a method for producing a molded body in accordance with claim 1.
- the invention also provides a headphone housing as defined in claim 4.
- a laser light is irradiated on the surface of a unitary molded body of a thermoplastic synthetic resin for foaming the surface of the molded body for printing a letter, figure or the like.
- the laser light is irradiated on the surface of the molded body of a thermoplastic synthetic resin and, when the surface irradiated with the laser light is heated to a temperature not lower than the melting point of the resin, which is not lower than 120°C, moisture or air contained in the molded body are expanded to generate air bubbles.
- the resulting foamed portions present a color different from the unfoamed portions and thus become the printed portions conforming to the predetermined letters, figures or the like.
- Fig. 1 is a perspective view showing a housing of an inner ear type headphone as a synthetic resin molded body to which a letter printing method according to the present invention is applied.
- Fig. 2 is a perspective view showing an example of printing a letter on a cord-holding part of the housing.
- Fig. 3 is a perspective view showing an example of printing a letter on a key top of a keyboard device.
- thermoplastic synthetic resin is processed by molding, such as injection molding or compression molding, to produce a molded body of a desired shape.
- the molded body, to which the present invention is applied is produced from a thermoplastic synthetic resin.
- a thermoplastic synthetic resin used for forming the molded body is a heat-resistant resin having a melting point not lower than 120°C, such as ABS resin, acrylic resin, polycarbonate resin or AS resin. More specifically, an ABS resin prepared and sold by Mitsubishi rayon Co. Ltd. under the trade name of "Diapet ABS" (registered trade mark), grade HF-5 or HF-3, may be preferably employed.
- ABS resin is processed by injection molding to produce an inner ear type (or auricle inserting type) headphone housing 1, as shown in Fig. 1.
- This housing 1 is a unitary molded body which is made up of a speaker unit housing section 2 for housing a speaker unit and a cord holding section 3 through which is inserted an outer extension cord adapted for supplying acoustic signals to the speaker unit accommodated in the housing section 2.
- a laser light is irradiated on the outer peripheral surface of the cord holding section 3 of the housing 1 so as to be in correspondence with a desired letter, figure or the like. That is, using a laser irradiating device, such as a laser marker, the laser light is irradiated at a letter printing position of the cord holding section 3 so as to be in correspondence with a desired letter, figure etc. The region irradiated with the laser light is now softened due to heating by the laser light to a temperature not lower than the melting point of the ABS resin of the cord holding section 3. On laser light irradiation and softening in this manner, any moisture and air contained in the ABS resin is expanded and foamed.
- the laser light suitable for such synthetic resin is the Nd: YA laser having a wavelength of 1.06 ⁇ m.
- the regions of the molded body where the laser light is irradiated are foamed and changed to a color tint which is a color mixture of, for example, a color due to the difference in density from an unirradiated region, a color due to burning by the laser light, and so forth.
- the irradiated regions are also relieved by a volume corresponding to expansion and foaming. These relieved portions become letters in relief representative of a letter, figure etc. of a desired contour.
- a letter or a figure is produced on the outer periphery of the cylindrical cord holding section 3 of the headphone housing 1.
- the letter or figure may be formed on the molded body in a non-contact fashion by the laser light as described above, it may also be formed on the bottom surface of a recess such as a pressure surface 6 on a key top 5 of a keyboard device.
- the thermoplastic synthetic resin material constituting the molded body employed in the present method may be any synthetic resin provided that moisture or air contained therein may be expanded and foamed on irradiation of the laser light and air bubbles produced on expansion are not liable to explosion.
- the resin material may include acrylic resins, polycarbonate resins and AS resins, besides the above mentioned ABS resin.
- resin materials exhibiting a high degree of viscosity at the melting point of the resin.
- the printing region is not limited to a smooth surface, but may be a rough satinized surface. Since the letter or figure printing by the inventive method is achieved by changes in color tint due to foaming of the synthetic resin constituting the molded body, letter or figure printing may be made by changes in color produced by foaming of the synthetic resin constituting the molded body. Even though the printing surface is a rough satinized surface, color difference is produced between the irradiated and unirradiated regions to effect printing.
- letter or figure printing by the present invention, is achieved by foaming of the synthetic resin molded body, the produced letter or figure is integral with the molded body Thus the letter or figure may be positively safeguarded against peeling due to contact with hand or figure and shows excellent abrasion resistance and durability. In addition, those portions relieved by foaming may be clearly distinguished from the remaining portions to form clear printed letters or figures. Since the printing is formed by expansion and foaming of the synthetic resin, a sufficient abrasion resistance and durability may be assured even when printing is made on surfaces frequently contacted by hand or finger, such as an inner ear type headphone or key top, while the printed letter or figure is clear and easy to view without fatigue.
- printing on the synthetic resin is by means of the laser light
- printing may be made on three-dimensional surfaces, such as cylindrical or recessed surfaces without constraints as to the printing surfaces, and hence versatile in practical application.
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Printing Methods (AREA)
Description
- This invention relates to a method for printing on a molded body of a thermoplastic synthetic resin and a headphone housing on the surface of which printing has been made by the printing method.
- Heretofore, as a method for printing on a molded body of a synthetic resin, such as an inner ear type headphone housing or a keytop of a keyboard device, a printing method such as a silk screen printing has been extensively applied. The silk screen printing method includes the steps of transfer printing a letter, character or a figure on the surface of a synthetic resin molded body with a thermosetting ink, such as an epoxy resin, white pigment or a silver white pigment, and heat setting said ink for burning and printing the letter etc. on the surface of the molded body.
- With the letter or figure, obtained by such printing method, since the thermosetting ink is simply applied to the surface of the molded body, it is easily abraded by friction or peeled off during handling and thus becomes hardly visible.
- For overcoming such inconvenience, there is also known a printing method which makes use of a laser light. With this method, a coating of aluminum, for example, is formed on the surface of a synthetic resin molded body by vacuum deposition and the coating is irradiated with the laser light for selectively removing the coating in accordance with the contour corresponding to the desired letter, figure etc. to expose the underlaying surface of the molded body to effect printing.
- There is additionally known a printing method in which the surface of the synthetic resin molded body is irradiated with a laser light to remove the surface of the molded body by engravure so that removed portions represent a predetermined letter, figure or the like.
- With these prior-art printing methods by the laser, printing with excellent abrasion resistance and durability may be achieved. However, with the printing method in which the aluminum coating is applied on the surface of the molded body and the coating is selectively removed by engravure for printing, the printing process is complex and expensive. On the other hand, with the printing method of removing the surface of the molded body by engravure, the printing is of the same color as the molded body and hard to see or indistinguishable from the background.
- US 4 032 691 discloses a recording material comprising a highly thermally insulating support on which is provided a heat-sensitive layer which deforms when exposed to radiation having a high energy density.
- It is an object of the present invention to provide a printing method by the laser light enabling clear, aesthetic and distinguishable printing durably and easily.
- It is another object of the present invention to provide a headphone housing on which clear, aesthetic and durable printing has been made in a manner readily distinguishable from the background.
- The present invention provides a method for producing a molded body in accordance with claim 1. The invention also provides a headphone housing as defined in
claim 4. - With the method in accordance with the present invention, in view of the properties of a thermoplastic synthetic resin of foaming on high heat application, a laser light is irradiated on the surface of a unitary molded body of a thermoplastic synthetic resin for foaming the surface of the molded body for printing a letter, figure or the like.
- With this method, the laser light is irradiated on the surface of the molded body of a thermoplastic synthetic resin and, when the surface irradiated with the laser light is heated to a temperature not lower than the melting point of the resin, which is not lower than 120°C, moisture or air contained in the molded body are expanded to generate air bubbles. The resulting foamed portions present a color different from the unfoamed portions and thus become the printed portions conforming to the predetermined letters, figures or the like.
- Other objects and advantages of the present invention will become more apparent from the following description of a certain illustrative embodiment of the present invention.
- Fig. 1 is a perspective view showing a housing of an inner ear type headphone as a synthetic resin molded body to which a letter printing method according to the present invention is applied.
- Fig. 2 is a perspective view showing an example of printing a letter on a cord-holding part of the housing.
- Fig. 3 is a perspective view showing an example of printing a letter on a key top of a keyboard device.
- An illustrative embodiment of the present invention will be explained in detail.
- For application of the letter printing method of the present invention, a thermoplastic synthetic resin is processed by molding, such as injection molding or compression molding, to produce a molded body of a desired shape.
- The molded body, to which the present invention is applied, is produced from a thermoplastic synthetic resin. Such synthetic resin used for forming the molded body is a heat-resistant resin having a melting point not lower than 120°C, such as ABS resin, acrylic resin, polycarbonate resin or AS resin. More specifically, an ABS resin prepared and sold by Mitsubishi rayon Co. Ltd. under the trade name of "Diapet ABS" (registered trade mark), grade HF-5 or HF-3, may be preferably employed.
- The above ABS resin is processed by injection molding to produce an inner ear type (or auricle inserting type) headphone housing 1, as shown in Fig. 1.
- This housing 1 is a unitary molded body which is made up of a speaker
unit housing section 2 for housing a speaker unit and acord holding section 3 through which is inserted an outer extension cord adapted for supplying acoustic signals to the speaker unit accommodated in thehousing section 2. - A laser light is irradiated on the outer peripheral surface of the
cord holding section 3 of the housing 1 so as to be in correspondence with a desired letter, figure or the like. That is, using a laser irradiating device, such as a laser marker, the laser light is irradiated at a letter printing position of thecord holding section 3 so as to be in correspondence with a desired letter, figure etc. The region irradiated with the laser light is now softened due to heating by the laser light to a temperature not lower than the melting point of the ABS resin of thecord holding section 3. On laser light irradiation and softening in this manner, any moisture and air contained in the ABS resin is expanded and foamed. The laser light suitable for such synthetic resin is the Nd: YA laser having a wavelength of 1.06 µm. - The regions of the molded body where the laser light is irradiated are foamed and changed to a color tint which is a color mixture of, for example, a color due to the difference in density from an unirradiated region, a color due to burning by the laser light, and so forth. The irradiated regions are also relieved by a volume corresponding to expansion and foaming. These relieved portions become letters in relief representative of a letter, figure etc. of a desired contour.
- In the above embodiment, a letter or a figure is produced on the outer periphery of the cylindrical
cord holding section 3 of the headphone housing 1. However, since the letter or figure may be formed on the molded body in a non-contact fashion by the laser light as described above, it may also be formed on the bottom surface of a recess such as apressure surface 6 on akey top 5 of a keyboard device. - The thermoplastic synthetic resin material constituting the molded body employed in the present method may be any synthetic resin provided that moisture or air contained therein may be expanded and foamed on irradiation of the laser light and air bubbles produced on expansion are not liable to explosion. Thus the resin material may include acrylic resins, polycarbonate resins and AS resins, besides the above mentioned ABS resin. In order to prevent the air bubbles from being exploded, it is preferred to employ resin materials exhibiting a high degree of viscosity at the melting point of the resin.
- The printing region is not limited to a smooth surface, but may be a rough satinized surface. Since the letter or figure printing by the inventive method is achieved by changes in color tint due to foaming of the synthetic resin constituting the molded body, letter or figure printing may be made by changes in color produced by foaming of the synthetic resin constituting the molded body. Even though the printing surface is a rough satinized surface, color difference is produced between the irradiated and unirradiated regions to effect printing.
- Since letter or figure printing, by the present invention, is achieved by foaming of the synthetic resin molded body, the produced letter or figure is integral with the molded body Thus the letter or figure may be positively safeguarded against peeling due to contact with hand or figure and shows excellent abrasion resistance and durability. In addition, those portions relieved by foaming may be clearly distinguished from the remaining portions to form clear printed letters or figures. Since the printing is formed by expansion and foaming of the synthetic resin, a sufficient abrasion resistance and durability may be assured even when printing is made on surfaces frequently contacted by hand or finger, such as an inner ear type headphone or key top, while the printed letter or figure is clear and easy to view without fatigue.
- Since printing on the synthetic resin is by means of the laser light, printing may be made on three-dimensional surfaces, such as cylindrical or recessed surfaces without constraints as to the printing surfaces, and hence versatile in practical application.
- Finally, since letter or figure printing is achieved solely by laser light irradiation on the surface of the molded body, the printing process is simplified at low costs.
Claims (5)
- A method for producing a molded body having a letter of a figure (4) printed on the surface (3, 6) of the body (1, 5) characterized in that the method comprises :molding a body, from a thermoplastic synthetic resin having a melting point not lower than 120°C and containing moisture or air, into a unitary molded body; andirradiating a predetermined area of said unitary molded body with a laser light to cause heating to a temperature not lower than the melting point of the thermoplastic synthetic resin, thereby to expand the moisture or air contained in said molded body to foam said surface to produce color changes in said area, the area corresponding to the letter or figure.
- The method as claimed in claim 1, wherein said laser light is an Nd-YAG laser having a wavelength of 1.06µm.
- The method as claimed in claim 1, wherein said predetermined area on said surface of said molded body is softened by the heating caused by the irradiation to cause said surface to be expanded and relieved.
- A headphone housing (1) molded from a thermoplastic synthetic resin comprising a containing section (2) containing a speaker unit, and a cord holding section (3) holding a cord supplying acoustic signals to said speaker unit, characterized in that the thermoplastic synthetic resin has a melting point not lower than 120°C and contains moisture or air, the housing (1) comprising a unitary molded body, said cord holding section (3) having a foamed portion (4) in the form of a letter or figure caused by expansion of the moisture or air in the thermoplastic synthetic resin and which is obtainable by irradiating said portion (4) by laser to cause heating of that portion (4) to a temperature not lower than the melting-point of the thermoplastic synthetic resin.
- The headphone housing as claimed in claim 4, wherein said foamed section (4) indicates an identification number of said headphone housing (1).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2203519A JPH0489285A (en) | 1990-07-31 | 1990-07-31 | Printing on synthetic resin molding product |
JP203519/90 | 1990-07-31 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0469982A2 EP0469982A2 (en) | 1992-02-05 |
EP0469982A3 EP0469982A3 (en) | 1992-07-08 |
EP0469982B1 true EP0469982B1 (en) | 1996-10-09 |
Family
ID=16475500
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91402120A Expired - Lifetime EP0469982B1 (en) | 1990-07-31 | 1991-07-29 | Method for printing on a synthetic resin molded body and headphone housing on which printing has been made by the method |
Country Status (4)
Country | Link |
---|---|
US (1) | US5227099A (en) |
EP (1) | EP0469982B1 (en) |
JP (1) | JPH0489285A (en) |
DE (1) | DE69122576T2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007118654A2 (en) | 2006-04-13 | 2007-10-25 | Giesecke & Devrient Gmbh | Id card comprising a contoured relief structure, and corresponding production method |
EP2555924B1 (en) | 2010-04-08 | 2016-03-09 | De La Rue International Limited | Security articles comprising security features |
CN109367040A (en) * | 2018-09-28 | 2019-02-22 | 东莞华晶粉末冶金有限公司 | Intelligence wearing face-piece and preparation method thereof |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE1008341A3 (en) * | 1994-05-04 | 1996-04-02 | Dsm Nv | Form part of a mark in surface of a thermoplastic plastic and method for form part of preparation. |
JP3682856B2 (en) * | 2001-01-15 | 2005-08-17 | トヨタ自動車株式会社 | Method for producing partially foamed resin molded product by laser |
DE102007050363A1 (en) | 2007-10-15 | 2009-04-16 | Forschungsinstitut für Pigmente und Lacke e.V. | Method for laser marking a polymer material |
FI20085708A0 (en) * | 2008-07-07 | 2008-07-07 | Stora Enso Oyj | A method for modifying the surface of a disposable container and a disposable container |
DE102009029381A1 (en) | 2009-09-11 | 2011-03-24 | Robert Bosch Gmbh | Surface mark and/or label for forming on e.g. duroplast material of housing of battery sensor in motor vehicle, has smooth and/or glow area provided in dull or rough environment, where label is formed on material of housing using mold |
ES2550692B1 (en) * | 2014-05-07 | 2016-09-14 | Bsh Electrodomésticos España, S.A. | Method for producing a household appliance component and household appliance component |
JP6580324B2 (en) * | 2014-12-17 | 2019-09-25 | 富士通コンポーネント株式会社 | Decorative molded products and decorative molded product units |
JP7027260B2 (en) * | 2017-10-18 | 2022-03-01 | 日本特殊陶業株式会社 | Manufacturing method of plastic products, manufacturing method of connectors and manufacturing method of sensors |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3368014A (en) * | 1963-05-01 | 1968-02-06 | Continental Can Co | Printing onto foamed plastics |
US3627858A (en) * | 1969-11-24 | 1971-12-14 | Monsanto Res Corp | Method for selectively foaming the surface of a thermoplastic article by use of a laser |
US4096218A (en) * | 1973-07-19 | 1978-06-20 | Asahi-Dow Limited | Method of producing foamed thermoplastic resin articles having smooth and glossy surfaces free from swirl marks and hair cracks |
JPS5932319B2 (en) * | 1974-03-22 | 1984-08-08 | 富士写真フイルム株式会社 | recording material |
US3949028A (en) * | 1974-10-23 | 1976-04-06 | Eiwa Chemical Industrial Co., Ltd. | Method of making cellular polymeric shaped articles having relief patterns |
US4092518A (en) * | 1976-12-07 | 1978-05-30 | Laser Technique S.A. | Method of decorating a transparent plastics material article by means of a laser beam |
US4260575A (en) * | 1979-11-05 | 1981-04-07 | Koss Corporation | Method for molding ear cushions |
US4407768A (en) * | 1982-01-08 | 1983-10-04 | Phillips Petroleum Company | Foamable polymeric composition comprising propylene polymer and hydrated alumina |
DE3213315C2 (en) * | 1982-04-08 | 1986-10-09 | GAO Gesellschaft für Automation und Organisation mbH, 8000 München | Process for the production of a multi-layer identification card |
EP0192843B1 (en) * | 1985-01-26 | 1991-07-31 | AEG Olympia Office GmbH | Method for making inscriptions on keys for typing of office machines, made of plastic which changes colour under action of a laser beam |
US4559367A (en) * | 1985-04-12 | 1985-12-17 | The Dow Chemical Company | Combination blowing agent and filler for thermoplastic foams |
-
1990
- 1990-07-31 JP JP2203519A patent/JPH0489285A/en active Pending
-
1991
- 1991-07-23 US US07/734,735 patent/US5227099A/en not_active Expired - Fee Related
- 1991-07-29 DE DE69122576T patent/DE69122576T2/en not_active Expired - Fee Related
- 1991-07-29 EP EP91402120A patent/EP0469982B1/en not_active Expired - Lifetime
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007118654A2 (en) | 2006-04-13 | 2007-10-25 | Giesecke & Devrient Gmbh | Id card comprising a contoured relief structure, and corresponding production method |
US8181993B2 (en) | 2006-04-13 | 2012-05-22 | Giesecke & Devrient Gmbh | ID card comprising a contoured relief structure, and corresponding production method |
EP2555924B1 (en) | 2010-04-08 | 2016-03-09 | De La Rue International Limited | Security articles comprising security features |
EP2555924B2 (en) † | 2010-04-08 | 2022-08-10 | De La Rue International Limited | Security articles comprising security features |
CN109367040A (en) * | 2018-09-28 | 2019-02-22 | 东莞华晶粉末冶金有限公司 | Intelligence wearing face-piece and preparation method thereof |
CN109367040B (en) * | 2018-09-28 | 2021-06-04 | 东莞华晶粉末冶金有限公司 | Intelligent wearable shell and manufacturing method thereof |
Also Published As
Publication number | Publication date |
---|---|
US5227099A (en) | 1993-07-13 |
DE69122576D1 (en) | 1996-11-14 |
DE69122576T2 (en) | 1997-02-13 |
EP0469982A2 (en) | 1992-02-05 |
JPH0489285A (en) | 1992-03-23 |
EP0469982A3 (en) | 1992-07-08 |
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